V-PCRF S9 Session Conflict Avoidance via Feedback
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Solution Overview
Problem
The existing methods for establishing an S9 sub-session in the context of 3GPP EPS networks face conflicts and instability, particularly when determining whether an S9 session is established, leading to incorrect flow execution and system instability.
Innovation Solution
The proposed solution involves a method where a V-PCRF receives an S9 session establishment triggering message and determines whether the S9 session is established, indicating this status to the H-PCRF through acknowledgement messages, thereby avoiding conflicts and ensuring proper processing during the establishment of S9 sub-sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the H-PCRF sends an S9 session establishment triggering message to the V-PCRF to trigger the establishment of an S9 session and S9 sub-session, then the policy control for EPC-routed traffic can be established, but if the S9 session is already established (due to concurrent execution of Steps S406 and S416), the V-PCRF will execute the wrong flow and cause system instability
Solution Approach 1:
The patent applies feedback by having the V-PCRF send an acknowledgement message back to the H-PCRF to indicate whether the S9 session is already established. This feedback mechanism allows the H-PCRF to understand the current session state and avoid executing incorrect flows, thereby preventing system instability while maintaining a relatively simple process structure.
Solution Approach 2:
The patent applies preliminary action by having the V-PCRF check whether the S9 session is already established before proceeding with the session establishment process. This preliminary check prevents redundant operations and potential conflicts, ensuring system reliability without significantly increasing process complexity.
2Ease of operation
If the V-PCRF does not indicate the S9 session establishment status to the H-PCRF, then the communication protocol remains simple, but the H-PCRF cannot determine whether to send the S9 sub-session establishment triggering message, leading to flow execution errors
Solution Approach 1:
The patent introduces a feedback mechanism where the V-PCRF sends an acknowledgement message to the H-PCRF indicating the S9 session establishment status. This maintains protocol simplicity by using existing message formats while ensuring that critical status information is not lost, allowing the H-PCRF to make informed decisions about subsequent message sending.
3Productivity
If concurrent execution of Steps S406 and S416 is allowed, then the system can handle multiple access scenarios simultaneously, but the H-PCRF may receive messages in an unexpected order and execute wrong flows
Solution Approach 1:
The patent resolves the concurrency issue by implementing a feedback mechanism where the V-PCRF informs the H-PCRF of the S9 session establishment status. This allows concurrent execution of multiple access scenarios while ensuring message processing correctness, as the H-PCRF can adjust its behavior based on the feedback received about the current session state.
Data Source
AI summary
Provided are a method, an apparatus and a system for establishing a session. In the method, a Visit Policy and Charging Rules Function (V-PCRF) receives an S9 session establishment triggering message from a Home Policy and Charging Rules Function (H-PCRF), wherein the S9 session establishment triggering message is used for triggering establishment of an S9 session and a first S9 sub-session, and the first S9 sub-session is used for policy control of Evolved Packet Core (EPC)-routed traffic; the V-PCRF determines whether the S9 session has been or is being established; and when it is determined that the S9 session has been or is being established, the V-PCRF indicates to the H-PCRF that the S9 session has been or is being established. Through the solution, conflict is avoided in the process of establishing the S9 sub-session in the related art and the stability of the system is improved.